import re

from django_redis import get_redis_connection
from rest_framework import serializers
from rest_framework_jwt.settings import api_settings

from celery_tasks.email.tasks import send_verify_email
from goods.models import SKU
from users.models import User, Address


class CreateUserSerializer(serializers.ModelSerializer):
    """创建用户序列化器"""
    password2 = serializers.CharField(label="确认密码", write_only=True)
    sms_code = serializers.CharField(label="短信验证码", write_only=True)
    allow = serializers.BooleanField(label="同意协议", write_only=True)
    # 增加token字段
    token = serializers.CharField(label='登录状态token', read_only=True)

    def create(self, validated_data):
        """创建用户"""
        # User.objects.create()  # 这样不会对密码进行加密
        user = User.objects.create_user(
            username=validated_data.get('username'),
            password=validated_data.get('password'),
            mobile=validated_data.get('mobile'))

        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER  # 生payload部分的方法(函数)
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER  # 生成jwt的方法(函数)
        #  {'exp': xxx, 'email': '', 'user_id': 1, 'username': 'admin'}
        # user：登录的用户对象
        payload = jwt_payload_handler(user)  # 生成payload, 得到字典
        token = jwt_encode_handler(payload)  # 生成jwt字符串
        user.token = token

        return user

    class Meta:
        model = User
        fields = ('id', 'username', 'password', 'password2', 'sms_code', 'mobile', 'allow', 'token')
        extra_kwargs = {
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {
                    'mix_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

    def validate_mobile(self, value):
        """验证手机号"""
        if not re.match(r'^1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式错误')
        return value

    def validate_allow(self, value):
        """检验用户是否同意协议"""
        if not value:
            raise serializers.ValidationError('请同意用户协议')
        return value

    def validate(self, attrs):
        # 判断两次密码是否一致
        if attrs['password'] != attrs['password2']:
            raise serializers.ValidationError("两次密码不一致")

        # 判断短信验证码
        redis_conn = get_redis_connection('sms_codes')
        mobile = attrs['mobile']
        real_sms_code = redis_conn.get('sms_%s' % mobile)
        if not real_sms_code:
            raise serializers.ValidationError('无效的短信验证码')
        if attrs['sms_code'] != real_sms_code.decode():
            raise serializers.ValidationError('短信验证码错误')
        return attrs


class UserDetaelSerializer(serializers.ModelSerializer):
    """用户详细信息序列化器"""
    class Meta:
        model = User
        fields = ('id', 'username', 'mobile', 'email', 'email_active')


class EmailSerializer(serializers.ModelSerializer):
    """
    修改用户邮箱序列化器
    """
    class Meta:
        model = User
        fields = ('id', 'email')
        extra_kwargs = {
            'email': {
                'required': True  # 请求时，需要传递此参数
            }
        }

        # 修改一条用户数据
        # instance:要修改的用户对象
    def update(self, instance, validated_data):
        # （1）校验用户邮箱 (不需要主动做）

        # （2）保存用户邮箱
        # user = super().update(instance, validated_data)
        email = validated_data.get('email')
        instance.email = validated_data.get('email')
        instance.save()
        # （3）生成邮箱激活链接
        # verify_url:http://www.meiduo.site:8080/success_verify_email.html?token=
        verify_url = instance.generate_verify_email_url()
        print('verify_url', verify_url)
        # （4）发送激活链接到用户邮箱
        send_verify_email.delay(email, verify_url)

        return instance


class AddBrowseHistorySerializer(serializers.Serializer):
    """
       添加用户浏览历史序列化器
       """
    sku_id = serializers.IntegerField(label="商品SKU编号", min_value=1)

    def validate_sku_id(self, value):
        """
        检验sku_id是否存在
        """
        try:
            SKU.objects.get(id=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('该商品不存在')
        return value

    def create(self, validated_data):
        """
        保存
        """
        # 序列化器用于GenericAPIView时，会有一个字典类型的属性叫context，里面包含了request对象
        user_id = self.context.get('request').user.id
        sku_id = validated_data['sku_id']

        redis_conn = get_redis_connection("history")
        pl = redis_conn.pipeline()

        # 移除已经存在的本商品浏览记录
        pl.lrem("history_%s" % user_id, 0, sku_id)
        # 添加新的浏览记录
        pl.lpush("history_%s" % user_id, sku_id)
        # 只保存最多5条记录
        pl.ltrim("history_%s" % user_id, 0, 4)
        pl.execute()

        return validated_data


class UserAddressSerializer(serializers.ModelSerializer):
    """
    用户地址序列化器
    """
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')

    def validate_mobile(self, value):
        """
        验证手机号
        """
        if not re.match(r'^1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式错误')
        return value

    def create(self, validated_data):
        """
        保存
        """
        validated_data['user'] = self.context['request'].user
        return super().create(validated_data)


class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """
    class Meta:
        model = Address
        fields = ('title', )
